Brake drum refinishing tool



Feb. 5, 1935. E, w. DENKE ET AL BRAKE DRUM REFINISHING TOOL aSheets-Sheet 1 Feb. 5, 1935. E. w. DENKE Er AL BRAKE DRUM REFINISHINGTOOL 3 Sheets-Sheet 2 Filed. Jan. 21, 1929 frzz'enih; Edward 14 p ale 6Frazzlifiawr I zi 2227' Feb. 5, 1935.

E. W. DENKE ET AL BRAKE DRUM REFINISHING' TOOL Filed Jan 21, 1929 3Sheets-Sheet 3 Patented Feb. 5, 1935 v m. v

UNITEDTSTATITES PATENT oFric BRAKE DRUM REFINISHING TOOL Edward W. DenkeandFrank E. BauerIe PhiIaF 7 delphia,"Pa., assignors to said Frank E.Bauerle Application January21, 1929, Serial No. 333,322

- 11 Claims. .(01. 82-4) The principal object of this invention is totapered bore E forthe "reception of the axle. provide an inexpensive andefficient portable The brake drum 0, in the present instance, compower-driven device for refinishing the brake prises a disk having aflange 0 provided with drums of ei'ther front or rear automobile wheels.brake-engaging lfaces c 0 adapted to been- 5 Another object of theinvention is to construct gaged byan external brake band and internal "5the device in such a manner that-a conventional brake shoesrespectively. The brake drum C is type of electric drill may 'beutilized'to supply secured to the wheel, 'in.the present instance, :bythe necessary power for operating the device. bolts F. r T

Another "object or the invention is to provide The refinishing device,made in accordance thedevice with means for preventing'chattering withthe principles of our invention, comprises a 10 o'f' the-finishingtoolduring the refinishing operapost 1 which is adapted to 'be axiallyaligned tion, thus making an' evenly finished face on the with the wheeland the'brake drum flange carried brake drum undergoing the refinishingoperathereby. The post 1 is adaptedto be-centered tion. l with respectto the wheel and the-drum flange Another objectof the-invention is toconstruct by means of conical members .2 and 3 which 15 the device insucha manner that it may be used are adapted to be seated in theopposite ends forfinis'hing either'an external or internal'brakeof thehub member D, in the circular openings engaging faceoi. the drum. formedtherein by the axle-receiving bore 'E. 9

Another fea'tureof the invention is the provi- The post 1 is providedwith an enlarged 'head sion df an automatically controlled feed for the4 forming a circular shoulder 5 which rests on 99 finishing tool toinsure an evensmooth face on a plate '7. Intermediate the -plat'e '1 andthe the-drum. v conical member-2 is .provideda series of filler IOtherob'jec'ts and rith'e construction of the deplates 8, 8 which areremovably positioned on vice in detail will hereinafter bedescribedJeferthe post 1, in order that the device may be ap-'encebe'ing had to the accompanying drawings, plied to variousautomobile wheels oi? which'the 25 of which: I lengths of the hubmembers D vary.

FigJ-lfis a=sideelevationof the device, showing The end of the post 1 isprovided withscrew. the 'dev'ice appliedto an automobile wheel whichthreads 9 which, in the present instance; are has been removed'fromtheautomobile; shown as being left hand threads, the purpose fifi l lanview taken on the line of which will be hereinafter described. "Thescrew 30 '2-' 2"o'f Fig. 1; r v threads 9 are adapted to receive asuitable secur- FigLB isa sectional'elevationtaken .011 the line 'ingnut 10 between which and the conical memi 2, andthowing the pp u l her 3is located a suitablewasher 1'1.

p O-fi rearalltombilewheel; The deviceis adapted to be rigidly-=securedm "Fig. 4 is-a=sectional 'elevati'on taken on the theautomobile wheelby tighteningthe -nut 10 85 lin 44 of F on the post 1,which drawsthe conical members is Sectional plan View .Wken on the 2 and3 into firm contact with the opposite'ends m t-" 4; of the hub D, theshoulder 5 drawing :the mm 40 a m ma plan plates '7 and 8 tightlytogetherland the nut 1.0 0 taken the'lme locking the whole rigidly tothe wheel, 9.Obvi'- Fig. "7 is a Si'deelevation of a detail-of the ouslythe conical membersztand 3 automatically invention' I i center the post1 with respect to the wheel as the Fig. 8 1s a sectional elevationillustrating .the but 10 is tightened on the Said post- 45 21 1222 11123:23;: fi fi ifinfigfigt brake n r d 9912 5 to Fig.9 is a fragmentarysectional elevation that from whlch the w r r q e r s -th showingthe'device applied-to'the iront"wheel or Post 1 prolects, 1Sprovldedmthen fin .2 zan-automobile l which is'of a lesser diameter than:thehead igand Fig. 1 illustrates an automobile wheel n as thus pr vi esa circular shoulder ifspn which having been removed from the automobileand S Sea-ted a disk disk. l nt ailly placed in a'horizontal positiononsuitable blocks bored to reciVe the Circular 1 1 0 1 .1 d or trestlesB, B with thebrake drum C facing is provided with a groove .15 which.isadaptedto upwardly. receivea key 16. The key :16 is seated partly *in"As shown in Fig. 3, the automobile wheel A the groove 15 and partly ina corresponding comprises the usual hub 'member Dhavin'g a groove 1'1formed :inthe extension :-12.":By' this 56 a suitable washer 21 beinginterposed between.

the nut 20 and the disk 14 and extending beyond the periphery of thecircular extension 12 and overlapping the said disk 14.

Rotatably mounted on the head 4 is a toolcarrying arm 25. The arm 25 isprovided with" a hub 26 suitably bushed as at- 27. The hub 26 ispositioned intermediate the supporting disk 14 and the plate 7, and isprovided on its end adjacent the supporting disk 14 with a spur gear 27which is secured to the said hub 26' by means of screws 28.

Axial movement of the hub 26 and arm 25 with respectzto 'the. head4w-is; prevented by the plate 7 and disk 14,";however,:thespacingof theshoulders 5 and Y13 of the said spindle 4 :is such that the armr25 andits hub: 26 are permitted free rotation aboutlthel head 4 of the postl.Meshing with thegear27 is a pinion 30 which is..'secured 'to the lowerend of'a vertically disposed shaft 31, under the disk 14. The shaft; 31is rotatablytmounted in a bearing 32formed in the said disk 14.1Secured, to the. opposite end ofthe shaft1131gand resting on the upperside of the disk14 is a spur gear 33. :The spur gear'33 meshes withapinion 34'which is: secured toone' endof a short I vertically disposedshaft '35. The shaft 35 is rotatably'mountedin the threaded projection18;within a bushing 36 located in a suitable bore 37 formed within theprojection 18. The upper end of the shaft '35 connected by meansof aflexible joint 37, to one end of a spindle 38. The shortshaft' 35, :thespindle 38 and the flexible connection 3'7 betweenythese two elementsconstitute a driving spindle by means of which-the device is operated. pR 7 qThe free end of the spindle 38 is adapted to bei'placed within ;andgripped by the chuck 3,9 of a convenientional typeof electric drill,such as that illustrated at 40. It willbeunderstood that theelectric'drill comprises a" motor 41 which is adapted tojrotate thechuck 39, said motor being supplied with 1 electric current, from asuitable source of supply through a cable 42.

- In the present instance, the flexible coupling- 37, betweentheshaft35andspindle 38, 'is in the form of,a tubecomposedjof 'rubberized fabricand is connected to theshaft 35 and spindle 36 at its opposite ends bybolts 43 and" 44 j respectively. Obviously any form-.of flexibleconnection between the shaft 35 and spindle 38 may be providedwithoutdeparting from the invention, the flexible joint being provided for thepurpose of obviating the nece'ssity of effecting absolute alignmentbetween the shaft 35 and the spindle ofthe electric drill which carriesand rotates the chuck 39, V v

A's shown inFig. 1, the electric drill is supported from the disk 14 bya pair of vertically disposed'standards.45. 45 which are-suitablysecured in'the said disk 14. Adjustably mounted on the standards 45 arecollars46, 46 respectively, which are adapted'to be'moved longitudinallyof thestandards45-and to be secured in the positions to'which they a-readjusted by means of set screws47...Eachof the collars 46 isprovidedwith a rod 48,on the up'per end'of which is formed alpair or.divergentuextensions 49. 49. f rmi g .2.

crotch 50 which is adapted to receive one of the handles 51, 51 whichproject laterally from the electric drill 40.

With this construction, 'theelectric drill may be readily detached fromthe device for use independent of the device, by merely loosening thechuck 39 to release the spindle 38, whereupon the electric drill may beraised, removing the handles 51, 51 thereof. from the crotches 50 inwhich they normally rest when the drill is being used in connection withthe device forming the subject of our invention.

The tool-supporting arm 25 is provided on one of its faces with adovetailed guideway 52 which extends longitudinally .of the arm andlaterally with respect to 'the'supporting post 1. slidably mounted onthe dovetailed guideway 52 is a tool-carrying carrlage53 which, in thepresent instance, is provided with a feed nut 55 adapted 'to receive'afeed screw 56. The feed screw 56 is rotatablymounted ina Plate 57 scured to the outer end of the arm 25,'col1ars 58fand 59 being secured tothe feed screw-56 for-preventing longitudinal movement of thescrew withrespect to the arm 25. The collar 59 is-provided with a handle 60,, bymeans of which the; screw- 56 may; be rotated to move the carriage 53;longitudinally of the arm 25 for purposes hereinafter set forth.

Thehorizontally movable .tool-carryingcarriage 53 provided with avertically disposed dovetailed guideway 61 which is adapted to receiveand to guide a-vertically movable tool head 62, the said head beingprovided-with an undercut groove 63 which is adapted to engage thedovetailed guideway 61 on the carriage 53. a y

The tool head 62 is provided with a-laterally extending lug 64 in whichis rotatably mounted a feed screw 65. The feed screw 65 is threaded intoa correspondingly-threaded opening 66 formed in the carriage 53. Collars66 and 67 are secured to the feed screw 65 at opposite sides of thelug64 in order that longitudinal movement of the feed screw 65willeflect a corresponding movement of the tool head 62 On the upper endof thefeed screw isa star 'wheel 68 having arms 69 which are adapted tobe engaged by-a depending extension'lOof a horizontally disposed rod'71. The rod 71 is adjustably mounted ina lug 72 formed on a collar 73which is slidably mounted ion-one of. the standards 45,

a set screw 74 being provided to retain'the collar 73 in the position towhich it may be adjusted. A set screw 76 is'provided for retaining therod '71 in its adjusted position with respect to the lug 72. Thisconstruction constitutes a dog for operating the feed screw 65. q I '1-l The lower end, of the tool head 62 is provided with a pairofdiagonally disposed and intersecting grooves 77 and '78 respectively,either ofwhich is adapted to receive a suitable form of finishing tool80.. 'A-jclamp 81 isip rovided to retain the tool within one ofthetool-receiving grooves '77, ,78.

In Fig. 1,' the tool 80 is shown in the operation v of finishing, theexternal; brake-engaging surface 0 of the brake drum C, thesaid toolbeing located within thettoolj-receiving groove 77 and in Fig. 8

the finishingtool is shown-as operating upon the internal brake-engagingsurface c the finishing tool 80 being located in the tool-receivinggroove 78 in the head 62.

, The clamp plate 81 is'so disposed with respect' to the diagonallydisposed grooves'77 and 78 that it will engage and hold the tool 80within the occupied groove, regardless of which of the grooves this maybe, a screw 79 being provided to draw the iclampplate 1-81 intoflrmic'ontact with the finish- .ingitool-80. v I

, ilnroperationdiheidevicezisirigidly cl-ampedtosan 'zautoinobilewheelzinithetmanner #abovenoted, .the

' 5 'l'conical members 2iand:3;automatically centering 80 :around and inoperative contact with :the' en *gaged brake-engaging surface of theflange :of 'the brake drum C.

Assuming that the operation :of the 'tool 80 .is started adjacent theouter edge :of the flange cl, eachrevolution of the :arm -will bring'oneof the arms -69 "into contact with the dog IO- 71 (lit :which will,gradually feed the .tool across the brake=engaging surface with whichit.is in contact, toward the body of the'wheel A, it being understood thatthe :rotation of the arm 25 is-accomplished by supplying electriccurrent to the :I1'l0170l41x0f theelectrioidrill 40, which through the.train 'ofgears 34', .33, 30:and -27 effects rotation of theiarm25 aboutthe supporting post '1.

, 'In order to obviate any chattering of the tool 80 due tothe teethoftherespective ,gears intermeshing -with each other, we have provided ameans for steadying the arm 25 in its rotation about the post 1, saidmeanscomprising a brake adapted tolride in-an annular! groove 86-formed.inthe hub 2610f the arm 25, The brake 85 comprises a steel band -87which is provided with a suitable lining (88 adapted to engage-the basesurface 1890f the groove 86. One end of the steel band :87 :is providedwith; a lug 9.0, through which tpasses-ar-stud 91 'which is secured-inthe plate 7 by means'of a nut 92. The opposite endof the steel band 87-is,provided with a lug 93 :having an opening -94, through whichproiectsa threaded stem:95. The stem 95 has on oneof its ends a .yoke 96 \whichspans the lug secured to the opposite end of the band, the stud .91passing through the arms.97, 9fl-of the yoke.96 which respectively lieabove .and below the .lug .90.

Adjustment of the brake bandt85 withrespect tothe hub.26isaccomplishedby an adjusting nut '98 threaded .on the stemr95. .By this means thebrake band .85 may be tightened or loosened to any desired extent withrespect to the hub 26, suchtighteningtending to retard the rotation of-the arm'25'and thereby prevent the above mentioned chattering of thetool80.

Fig. 9 illustrates the deviceas being-secured to 'a'front-wheel of anautomobile, the conemembers 2and 3being seated within the circularcavities G in which the racesof the ball or roller bearings of the frontwheels normally rest, the operation .of the device being thesameregardless of whether the device is applied to afront orarear wheel.

Obviously conical elements of various sizes may be'used in applying thedevice to different wheels wherein the diameters of the opening at theopposite ends of the wheel hubs vary to any marked degree.

The left 'hand screw threads on 'thepost l are provided so that asthe-arm 25 is :rotated and the tool 80 offers resistance tossuchrotation, this resistance being transmitted to the :disk .14 will tendto tightenthe post in the wheel rather'than loosen thesamawhich would betheloase event ofithe threadse:being rightihanded.

Obviously other terms :o'f'power units may be employed in place :of theeiectric drill, shown-{in the :drawings, :without departing from themain -features of'the invention.

"We claim:

l. A portable device, for refinishing the brake.

engaging surfaces of brake drums on 'automobile wheels, comprising apost adapted to be secured .to the automobile wheel, meansfor-axiallyaligning said post with said wheeland'the brake :drum concentricallydisposed thereon, a

tool-supporting element rotatably mounted 'on porting element forpreventing chattering of the tool in 'its'movement relative to'saidbrake drum. l

2. Apdrtable device, for refinishing the brake engaging surfacesot'brakedrums on automobile wheels, comprising a postadaptedto be securedtotheautolnobile wheel, meansfor-axi'ally align ing said post with saidwheel, and ithebrake drum concentrically disposed thereon, atool-support ing element rotatably mounted on said post, a tool carriedby said tool supporting element, means for rotating said tool-supportingelement about said post with saidtoolinengagement with a brake-engagingsurface of said drum, said means including a conventional form ofelectric 4 drill which comprises aspindle-receiv'ing chuck and a motoradapted for'rotating saidchuck, said device comprising a driving spindleoperatively connected to the tool-supporting element and adapted to bedetachably gripped and rotated by the chuck of said'electricflrill. Y

' 3. A portable device, forrefinishing the brake engaging surfaces ofbrake drums on automobile Wheels, comprising a post adapted "to besecured to the automobile wheel, means for-axially aligning said postwith said wheel'and'the brake drum concentrically disposed thereon, atool-supporting element rotatably mounted on said post, a tool carriedby said tool-supporting element, means for rotating said tool-supportingelement about said post with said tool in engagement with abrake-engaging surface :of said drum, said "means including aconventional form of electric drill which comprises a spindle-receiv ingchuck and a motor adapted for rotating said chuck, said devicecomprising a driving spindle operatively connected to thetool-supportirigelement and adapted to be detachably gripped and rotatedby the chuck of saidelectric drill, and means carried by said post forremov'ably supporting said electric drill on thedevice.

4. A portable device, for refinishing'the brake engaging surfaces ofbrake drums-on automobile wheels, comprising-a post=adapted to besecured to the automobile wheel, means'for axiallyaligning said postwith said wheel and the-brake drum concentrically disposed thereon,'atool-supporting element rotatably mounted on said post, a

tric =drill which comprisesve spindle-receiving :chuck and ;a motor:adapted :for c-rotating .s'aid vengaging surfaces of brake drums onautomobile chuck, said device comprising a driving spindle operativelyconnected to the tool-supporting elementand adapted to, bedetachably'gripped and rotated by the chuck or said electric drill, saiddriving spindle including a flexible connection permitting relativemisalignment 'between'said electric drill and the remaining elements ofthe device, and means carried by said post for removably supporting saidelectric drills on the device.

5. A portable device, for refinishing the brake wheels, said wheelincluding a hub having a circular opening extending longitudinallytherethrough, comprising a post adapted to pass through said hub openingand to be secured to the automobile wheel, means for axially aligningsaid post with said wheel and the brake drum concentrically disposedthereon, said aligning means comprising a pair of conical elementsdisposed in opposed relation to each other on said post withtheirbeveled sides respectively seated in the said circular opening atthe opposite ends of said hub,

a shoulder formed on said post at the outer end of one of said conicalelements,anut threaded on said post at the outer end of oppositely disposed conical element for drawing said conical elements into saidcircular opening and thereby centering said post relative to said wheel,spacer plates on said post between said shoulder and adjacent conicalelement, a tool-supporting element rotatably mounted on said post, atool carried by said tool-supporting element, means for rotating saidtool-supporting element about said post with saidtool in engagement witha brake-.

engagingsurface of said drum, and a brake engaging said tool-carryingelement and anchored to one of said spacer plates for preventingchattering of the toolrelative to the brake drum.

6. A portable device, for refinishing the brake engaging surfaces ofbrake drums on automobile wheels, comprising a post adapted to besecured to the automobile wheel, means for axially aligning said postwith said wheel and the brake drum concentrically disposed thereon, atool-supporting element rotatably mounted on said post, a tool carriedby said tool-supporting element, means .for rotating saidtool-supportingelement about said post with said tool in engagement with abrake-engaging surface of said drum, said means including a conventionalform of electric drill which comprises a spindle-receiving chuck and amotor adapted for rotating said chuck, said device comprising a drivingspindle operatively connected to the tool-supporting element and adaptedto be detachably gripped, and rotated by the chuck of said electricdrill, means carried by said post for removably supporting said electricdrill on thedevice, said means comprising a disk secured to said post,standards on said disk, and crotch ends on said standards adapted .toreceive the handles of said electric drill which extend laterally fromsaid electric drill.

7. A portable device, for refinishing the brake engaging surfaces ofbrake drums on automobile wheels, comprising a post adapted to besecured to the automobile wheel, means for axially align-. ing said postwith said wheel and the brake drum concentrically disposed thereon, atool-supporting, element rotatably mounted on said post, a tool carriedby said tool-supporting element, means for rotating said tool-supportingelement about said post with said tool in engagement with abrake-engaging surface of said drum, said means including a conventionalform of electric drill which comprises a spindle-receiving chuck thehandles of, said electric drillwhich extend laterally from said electricdrill, and means for adjusting said crotch ends relative to standards toaccommodate various conventional types of electric drills. 1

8. A portable device, iorrefinishing'the brakeengaging faces of brakedrums on automobile wheels, comprisingapost adapted to be secured toandaxiallyaligned withsaid wheel and the brake drum concentricallydisposed thereon, a tool-carrying arm rotatably mounted'on said post, atool carried by said arm'and adapted to engage a brake-engaging surfaceof said brake drumja disk rigidly secured to said post, means on saiddisk for supporting a conventional form of electric drill whichcomprises a motor'and achuck rotated by said motor, a drivingspindlerotatably mounted at one'oftits ends in said post, its opposite endbeing adapted to be gripped and rotated by said chuck, a pinion securedto s'aiddriving spindle adjacent said disk, a fiexible connectionincluded in said driving spindle between said pinprising a post arrangedtopass through a central opening in the hub of thewheel, a tool-carryingarm rotatably mounted on the post, an element rigidly secured toxthe'post and forming a shoulder at one sideof the arm to preventmovement of the arm in one direction longitudinally of the post, abearing plate on the post at the "opposite side of the arm providing ashoulder to prevent movement of the arm in the opposite directionlongitudinally of the post, a pair of conical elements adjustablelongitudinally on the post and arranged to beseated respectively in theopposite ends of the hub opening to vary the position of the post andconsequently the plane of rotation of the arm relative to the plane ofthe wheel and to center the post relative to the drum, a plurality ofreadily detachable filler plates on the post between one side of one ofsaid conical elements and the bearing plate .to rigidifythe opening inthe hub of the wheel, a tool-carrying arm rotatably mountedon the postin a fixed position longitudinally of the post, apair of, conicalelements adjustable longitudinally on the post and'arranged to be seatedrespectively in the opposite ends of the hub opening to vary theposition of the post and consequently the plane of rotation of the armrelative to, the plane of the wheel and to center the post relative tothe drum, a motor support rigidly secured to the post above the arm andpreventing movement of the arm in one direction longitudinally of thepost, means on the post below the arm preventing movement of the arm inan opposite direction on the post, a motor carried by said support infixed relation to the post and operatively connected to the arm forrotating the same around the post, a tool carriage slidably mounted formovement on the arm radially with'respect to the post, a tool headslidably mounted on the carriage for movement transversely of the armand parallel to the post, a tool carried by said head for engagementwith the drum, and means for automatically feeding the tool and. toolhead in said direction parallel to the post upon each revolution of thearm about the post. i

11. A portable device for refinishing a brake drum on an automobileWheel, said device comprising a post arranged to pass through a centralopening in the hub of the wheel, a tool-carrying arm rotatably mountedon the post in a fixed pothe post and arranged to be seated respectivelyin the opposite ends of the hub opening to center the post relative tothe drum, a motor support rigidly secured to the post above the arm andpreventing movement of the arm in one direction longitudinally of thepost, means on the post below the arm preventing movement of the arm inan opposite direction on the post, a motor carried by said support infixed relation to the post and operatively connected to the arm forrotating the same around the post, a tool carriage-slidably mounted formovement on the arm radially with respect to the post, a tool headslidably mounted on the carriage for movement transversely of the armand parallel to the post, a tool carried by said head for engagementwith the drum, and means for automatically feeding the tool and toolhead in said direction parallel to the post upon each revolution of thearm about the post.

EDWARD W. DENKE.

FRANK E. BAUERLE.

